Subframe bushings, differences between 68 and 69

[Bryan302]

While going through my parts bins today, I found a set of NOS subframe bushings, that I forgot I had.  Due to the fact that I needed them for my 69 I took them to the house and checked the numbers against the 68 and 69 AIM.  After checking all the numbers to make sure they were all correct, I discovered a difference between 68 and 69.  I have always heard, especially from the parts vendors, that they were all the same, and never doubted it, or had any reason to look.  They were all the same except two parts.

Here are the differences I found.  The #3 mount location, (under the front seats) are #13, 3901361, which are also the same for 68 and 69, but the mate cushion (donut), #10 3914802 for 68 and #15 3962720 for 69.

So, my questions are:

Has anybody ever compared between these two bushings 3914802 and 3962720, to see if they are actually different?

I know GM was notorious for changing the part number for the slightest change or difference.  Are they different enough to seek the correct part between these two?

Also, I noticed that part# 3893156 core support bushing was replaced with 14008366.  Are these parts that have been changed deemed INCORRECT for restoration purposes?  You might be able to see the numbers that are different.

Thanks,
Bryan

[Spooky]

Bryan, I just looked at my Nos bushings. The 802's look almost identical to the 720's I also thought they were the same just a part number change. upon further inspection the 720's have a metal ring molded into the bushing at the sub frame contact point. Never knew about it until now. The dealer gave me 4 802's when I bought mine. also gave me the 14008366's for the rad mounts. I was told that they were the same height and were used for Novas.

Scott

[Bryan302]

Thank you very much Scott!  I was afraid the 702's would be different enough, that I would have to hunt them down.  My set had the 802's for the rear mount, as well as the front, and were ordered for a 68, evidently.  I bet that ring on the 702's was to help prevent the bushing from splitting open, or cracking open over time.  You learn something everyday.

Thanks again,
Bryan

[firstgenaddict]

67's and 68's use a spring washer in the locations under the body...




This is the setup used under the rad support.

[Sauron327]

James,

The 67 bolts I have with original recessed heads are not like your 68-69 heads. I have 67, 8 and 9 original bolts and cars on hand. Spring washers are a constant.